CN105357406A - Circuit capable of locating ringing current breakdown fault of dispatching desk, and detection method for ringing current breakdown fault of dispatching desk - Google Patents
Circuit capable of locating ringing current breakdown fault of dispatching desk, and detection method for ringing current breakdown fault of dispatching desk Download PDFInfo
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- CN105357406A CN105357406A CN201510910552.0A CN201510910552A CN105357406A CN 105357406 A CN105357406 A CN 105357406A CN 201510910552 A CN201510910552 A CN 201510910552A CN 105357406 A CN105357406 A CN 105357406A
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- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 239000003381 stabilizer Substances 0.000 claims description 36
- 238000012423 maintenance Methods 0.000 claims description 4
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
- H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
- H04M3/32—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for lines between exchanges
- H04M3/323—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for lines between exchanges for the arrangements providing the connection (test connection, test call, call simulation)
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
- H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
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- Monitoring And Testing Of Exchanges (AREA)
Abstract
The invention relates to a circuit capable of locating a ringing current breakdown fault of a dispatching desk, and a detection method for the ringing current breakdown fault of the dispatching desk. The circuit comprises a ringing current detection circuit, a ringing current breakdown fault detection circuit, and a dummy load switch circuit. A triode T1 of the ringing current detection circuit is used for detecting whether there is ringing or not. A voltage-regulator tube in the ringing current breakdown fault detection circuit is used for judging whether a telephone is answered or not. The ringing current detection circuit and the ringing current breakdown fault detection circuit are used for judging whether a dummy load resistor RL is enabled to be disconnected or connected with a main loop L1 and a main loop L2 of a switcher interface of the dispatching desk or not, thereby solving a problem that a call cannot be answered because of a ringing current breakdown fault, achieving the removing of the fault, and achieving the safe and stable operation of the dispatching desk.
Description
Technical field
The present invention relates to dispatching desk control field, particularly relate to a kind of circuit and detection method thereof of locating dispatching desk ringing-current breakdown fault.
Background technology
Dispatching desk is widely used in electric power, railway, public security, a kind of particular terminal equipment of the dispatch control departments such as aviation, be connected with adopting digital circuit interface between voice exchange, the multiple dispatching desk of usual employing forms same dispatching desk group and runs, there is quick (hot key) calling and pickup feature, when there being phone incoming call, the telephone set that all dispatching desks of same dispatching desk group connect, send ringing tone under the ringing-current effect that just can send at each dispatching desk simultaneously, if when one of them dispatching desk is tried to be the first and is received calls, other dispatching desks with group just can stop ring immediately, and be in display in real time with the running status of other dispatching desks of group, if the phone conversed with other dispatching desks organized need be switched through, then after getting machine, only need insert strong can realization by next.
The ringing-current that dispatching desk sends to telephone set, usually 75 ± 15V/25 ± 3Hz is set to, if when having a dispatching desk or its telephone set to there is ringing-current breakdown fault in dispatching desk group (as shown in Figure 1), the impedance produced in its ringing-current breakdown process, DC impedance close when being easy to occur getting machine with telephone set, so switch just can be judged as that the telephone set of dispatching desk has entered and be got machine state, when telephone set enter get machine state time, switch just can send immediately and stop sending the order of ringing-current.Under the effect not having ringing-current voltage, telephone set just can recover paramount DC impedance state, when telephone set recovers paramount DC impedance state, switch just can be judged as that the telephone set of dispatching desk enters hook state, so switch just can send the order of taking out stitches immediately.Therefore, when ringing-current breakdown fault appears in a dispatching desk or the telephone set that is connected with dispatching desk, when there being phone incoming call, namely there will be the phenomenon of just on-hook immediately after fast fetching machine, thus cause all dispatching desks of this dispatching desk group, all cannot answer the consequence of all Inbound Calls.During machine of getting due to equivalence, compole is short, and in the equipment such as switch, dispatching desk and recording system, all cannot provide can the data of fault analysis and judgement, therefore, serious are had influence on safety, stable carrying out the work.
Humidity rainy season or service life longer dispatching desk and telephone set in; frequent meeting is random there is this type of fault; and usually only have the fault time of a few minutes; the difficulty of fixing a breakdown is very large; if have some dispatching desks to distribute different floors or area with group scheduling platform, the difficulty of fixing a breakdown can be larger.
Popularizing the today using touch-tone telephone, and under the condition that the connection distance of switch or dispatching desk and telephone set is closer again, being reduced by ringing-current voltage is the effective way eliminating or reduce ringing-current breakdown fault, but because of: one is that existing ringing current generator adopts highly integrated circuit to form and not easily adjusts; If two is that ringing-current voltage is reduced, the existing index request of Ministry of Industry and Information can not be met, and do not adopted by manufacturer.
Summary of the invention
The object of the invention is for above weak point, provide a kind of circuit and detection method thereof of locating dispatching desk ringing-current breakdown fault, the problem that the electricity that solution breakdown fault causes cannot be answered.
The scheme that technical solution problem of the present invention adopts is: a kind of circuit of locating dispatching desk ringing-current breakdown fault, it is characterized in that: comprise bell flowing detecting circuit, ringing-current breakdown fault testing circuit and dummy load switching circuit, described bell flowing detecting circuit is electrically connected by the base stage of electric capacity C1 one end through resistance R1, diode D5 and triode T1, and the collector electrode of triode T1 is connected to external power source positive pole through resistance R7; The other end of electric capacity C1 and input L1 and L2 of dispatching desk exchange interface major loop are electrically connected; Described ringing-current breakdown fault testing circuit is electrically connected through the base stage of resistance R4 and triode T2 by the anode of a voltage-stabiliser tube D6, and the collector electrode of triode T2 is connected to external power source positive pole through resistance R6 and is electrically connected with the base stage of triode T3; The collector electrode of triode T3 and the emitter of triode T1 are electrically connected, and the negative electrode of voltage-stabiliser tube D6 is electrically connected through input L1 and L2 of a bridge rectifier bridge and dispatching desk exchange interface major loop; Described dummy load switching circuit is made up of a triode T4 and dummy resistance RL, the base stage of described triode T4 and the emitter of triode T3 are electrically connected, the collector electrode of triode T4 is connected with the negative electrode of voltage-stabiliser tube D6 through dummy resistance RL, and the emitter of triode T4 is connected to another output of bridge rectifier bridge; The base stage of described triode T2 is all connected with the emitter of triode T4 with the emitter of emitter, triode T3, the base stage of triode T1.
Further, input L1 with L2 of described dispatching desk exchange interface major loop is connected with one end of electric capacity C1 through described bridge rectifier bridge; Output one end of described bridge rectifier bridge is connected with the negative electrode of voltage stabilizing end D6, and the other end is connected to the emitter of triode T4.
Further, the emitter of described triode T3 is connected with the emitter of triode T4 through electric capacity C4.
Further, the base stage of described triode T1 is connected with the emitter of triode T4 through resistance R2, R3.
Further, the base stage of described triode T2 is connected with the emitter of triode T4 with electric capacity C3 through resistance R5 respectively, and is connected with the emitter of described triode T2; The output of described resistance R4 be connected with electric capacity C3 with resistance R5 respectively.
Further, the emitter of described triode T1 is also electrically connected through the base stage of electric capacity C2 and resistance R2 and triode T1 respectively, and electric capacity C2 and resistance R2 is in parallel.
Further, the puncture voltage of described voltage-stabiliser tube D6 is 48V.
The present invention also provides a kind of a kind of detection method of locating the circuit of dispatching desk ringing-current breakdown fault as described above, comprises the following steps:
Step S0: detect whether have ring by the triode T1 of bell flowing detecting circuit; Judge whether telephone set gets machine by the voltage-stabiliser tube D6 in ringing-current breakdown fault testing circuit; If without ring and without getting machine, then dispatching desk is in static state, goes to step S1; If without ring, get machine, then dispatching desk sends exhalation, goes to step S2; If there is ring, without getting machine, then outside incoming call dispatching desk, goes to step S3; If there is ring, get machine, then outside incoming call dispatching desk, goes to step S4;
Step S1: the triode T1 of bell flowing detecting circuit is because ringing-current triggers cut-off; Because nothing gets machine, namely telephone set DC circuit is disconnected, in ringing-current breakdown fault testing circuit, voltage-stabiliser tube D6 punctures because of high feed voltage, the forward bias that triode T2 provides through resistance R4, resistance R5, electric capacity C3 and conducting, triode T3 ends, because triode T1 and T3 ends, make triode T4 in dummy load switching circuit cannot obtain forward bias current and end, dummy resistance RL and dispatching desk exchange interface major loop L1 and L2 major loop disconnect;
Step S2: the triode T1 of bell flowing detecting circuit is because ending without ringing-current trigger current, voltage-stabiliser tube D6 cannot puncture because getting low-voltage that machine is formed and end, triode T2 is ended without forward bias voltage, now triode T3 conducting, make the triode T4 of dummy load switching circuit obtain forward bias current because triode T1 ends and end, dummy resistance RL and dispatching desk exchange interface major loop L1 and L2 major loop disconnect;
Step S3: the triode T1 of bell flowing detecting circuit obtains forward bias current and conducting, and triode T1 maintains conducting to predetermined time; Now, because answering without getting machine, by voltage-stabiliser tube D6 conducting because of high electrical breakdown in ringing-current breakdown fault testing circuit, triode T2 conducting, triode T3 ends; Triode T1 reaches scheduled time cut-off, triode T3 ends, and triode T4 cannot obtain forward bias current and end, and dummy resistance RL and dispatching desk exchange interface major loop L1 and L2 major loop disconnect;
Step S4: the triode T1 conducting of bell flowing detecting circuit, voltage-stabiliser tube D6 cannot puncture because getting low-voltage that machine is formed and end, and triode T2 are ended, triode T3 conducting; Triode T1 is still in maintenance conducting state, and triode T4 conducting because of the conducting of triode T1 and T3, dummy resistance RL and dispatching desk exchange interface major loop L1 are communicated with L2 major loop, and maintain conducting to predetermined time.
Further, in step S3 or S4, when incoming call dispatching desk, by switch command scheduling platform to the ringing telephone stations connected separately.
Further, described high feed voltage is-48V, and the puncture voltage of described voltage-stabiliser tube D6 is 48V.
Compared with prior art, the present invention has following beneficial effect: detect whether have ring by the triode T1 of bell flowing detecting circuit; Judge whether telephone set gets machine by the voltage-stabiliser tube D6 in ringing-current breakdown fault testing circuit, judge whether dummy resistance RL and dispatching desk exchange interface major loop L1 and L2 major loop disconnect or connect according to bell flowing detecting circuit and ringing-current breakdown fault testing circuit, thus solve the problem that the incoming call that causes because of ringing-current breakdown fault cannot answer, fix a breakdown, realize the work of dispatching desk safety and stability.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, patent of the present invention is further illustrated.
Fig. 1 is dispatching desk and telephone interface circuit diagram.
Fig. 2 is the circuit theory diagrams of the embodiment of the present invention.
Fig. 3 is the flow chart of the detection method of the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further described.
As shown in Figures 1 to 3, the embodiment of the present invention provides a kind of circuit of locating dispatching desk ringing-current breakdown fault, it is characterized in that: comprise bell flowing detecting circuit, ringing-current breakdown fault testing circuit and dummy load switching circuit, described bell flowing detecting circuit is electrically connected by the base stage of electric capacity C1 one end through resistance R1, diode D5 and triode T1, and the collector electrode of triode T1 is connected to external power source positive pole through resistance R7; The other end of electric capacity C1 and input L1 and L2 of dispatching desk exchange interface major loop are electrically connected; Described ringing-current breakdown fault testing circuit is electrically connected through the base stage of resistance R4 and triode T2 by the anode of a voltage-stabiliser tube D6, and the collector electrode of triode T2 is connected to external power source positive pole through resistance R6 and is electrically connected with the base stage of triode T3; The collector electrode of triode T3 and the emitter of triode T1 are electrically connected, and the negative electrode of voltage-stabiliser tube D6 is electrically connected through input L1 and L2 of a bridge rectifier bridge and dispatching desk exchange interface major loop; Described dummy load switching circuit is made up of a triode T4 and dummy resistance RL, the base stage of described triode T4 and the emitter of triode T3 are electrically connected, the collector electrode of triode T4 is connected with the negative electrode of voltage-stabiliser tube D6 through dummy resistance RL, and the emitter of triode T4 is connected to another output of bridge rectifier bridge; The base stage of described triode T2 is all connected with the emitter of triode T4 with the emitter of emitter, triode T3, the base stage of triode T1.
In the present embodiment, input L1 with L2 of described dispatching desk exchange interface major loop is connected with one end of electric capacity C1 through described bridge rectifier bridge; Output one end of described bridge rectifier bridge is connected with the negative electrode of voltage stabilizing end D6, and the other end is connected to the emitter of triode T4.
In the present embodiment, the emitter of described triode T3 is connected with the emitter of triode T4 through electric capacity C4.
In the present embodiment, the base stage of described triode T1 is connected with the emitter of triode T4 through resistance R2, R3.
In the present embodiment, the base stage of described triode T2 is connected with the emitter of triode T4 with electric capacity C3 through resistance R5 respectively, and is connected with the emitter of described triode T2; The output of described resistance R4 be connected with electric capacity C3 with resistance R5 respectively.
In the present embodiment, the emitter of described triode T1 is also electrically connected through the base stage of electric capacity C2 and resistance R2 and triode T1 respectively, and electric capacity C2 and resistance R2 is in parallel.
In the present embodiment, the puncture voltage of described voltage-stabiliser tube D6 is 48V.
As shown in Figure 1, the feed voltage that feed circuit provides is-48V, and circuit provided by the invention can be connected on L1 and the L2 major loop of dispatching desk switch or a, b circuit of telephone set.
As shown in Figure 2, circuit provided by the invention, detects whether have ring by the triode T1 of bell flowing detecting circuit; Judge whether telephone set gets machine by the voltage-stabiliser tube D6 in ringing-current breakdown fault testing circuit, judge whether dummy resistance RL and dispatching desk exchange interface major loop L1 and L2 major loop disconnect or connect according to bell flowing detecting circuit and ringing-current breakdown fault testing circuit, thus solve the problem that the incoming call that causes because of ringing-current breakdown fault cannot answer, fix a breakdown, realize the work of dispatching desk safety and stability.
By this circuit, machine of the getting state caused by ringing-current breakdown fault is extended for a predetermined time (as 1-3 second), can realize following object:
(1) on the display screen of each dispatching desk of dispatching desk group, can analyze and judge that ringing-current punctures the number of dispatching desk, reach the object of location ringing-current breakdown fault dispatching desk;
(2) by the function of dispatching desk Converting telephone, the phone connecing ringing-current breakdown fault dispatching desk can be robbed, or callback can be carried out according to the title of caller identification or number;
(3) from the sound recordings of calling of switchboard record or recording system, the information analyzed and judge ringing-current breakdown fault dispatching desk can be found.
Dummy resistance RL can select larger resistance as far as possible, can not cause bad impact to the speech quality of dispatching desk.If the Lifetime of dummy resistance RL and L1 and L2 major loop is predefined for 3 seconds, then a dispatching desk can not carry out continuously receiving calls, carrying out receiving calls or initiate outbound calling operation again in 3 seconds, because the probability of this situation is not high, influence time is very short, therefore this shortcoming can be allowed to exist.
Circuit provided by the invention, only for analytical work principle, can be optimized according to actual, and the components and parts such as integrated circuit, photoelectrical coupler, relay can also be adopted to form.
The present invention also provides a kind of a kind of detection method of locating the circuit of dispatching desk ringing-current breakdown fault as described above, comprises the following steps:
Step S0: detect whether have ring by the triode T1 of bell flowing detecting circuit; Judge whether telephone set gets machine by the voltage-stabiliser tube D6 in ringing-current breakdown fault testing circuit; If without ring and without getting machine, then dispatching desk is in static state, goes to step S1; If without ring, get machine, then dispatching desk sends exhalation, goes to step S2; If there is ring, without getting machine, then outside incoming call dispatching desk, goes to step S3; If there is ring, get machine, then outside incoming call dispatching desk, goes to step S4;
Step S1: the triode T1 of bell flowing detecting circuit is because ringing-current triggers cut-off; Because nothing gets machine, namely telephone set DC circuit is disconnected, in ringing-current breakdown fault testing circuit, voltage-stabiliser tube D6 punctures because of high feed voltage, the forward bias that triode T2 provides through resistance R4, resistance R5, electric capacity C3 and conducting, triode T3 ends, because triode T1 and T3 ends, make triode T4 in dummy load switching circuit cannot obtain forward bias current and end, dummy resistance RL and dispatching desk exchange interface major loop L1 and L2 major loop disconnect;
Step S2: the triode T1 of bell flowing detecting circuit is because ending without ringing-current trigger current, voltage-stabiliser tube D6 cannot puncture because getting low-voltage that machine is formed and end, triode T2 is ended without forward bias voltage, now triode T3 conducting, make the triode T4 of dummy load switching circuit obtain forward bias current because triode T1 ends and end, dummy resistance RL and dispatching desk exchange interface major loop L1 and L2 major loop disconnect;
Step S3: the triode T1 of bell flowing detecting circuit obtains forward bias current and conducting, and triode T1 maintains conducting to predetermined time; Now, because answering without getting machine, by voltage-stabiliser tube D6 conducting because of high electrical breakdown in ringing-current breakdown fault testing circuit, triode T2 conducting, triode T3 ends; Triode T1 reaches scheduled time cut-off, triode T3 ends, and triode T4 cannot obtain forward bias current and end, and dummy resistance RL and dispatching desk exchange interface major loop L1 and L2 major loop disconnect;
Step S4: the triode T1 conducting of bell flowing detecting circuit, voltage-stabiliser tube D6 cannot puncture because getting low-voltage that machine is formed and end, and triode T2 are ended, triode T3 conducting; Triode T1 is still in maintenance conducting state, and triode T4 conducting because of the conducting of triode T1 and T3, dummy resistance RL and dispatching desk exchange interface major loop L1 are communicated with L2 major loop, and maintain conducting to predetermined time.
In the present embodiment, in step S3 or S4, when incoming call dispatching desk, by switch command scheduling platform to the ringing telephone stations connected separately.
In the present embodiment, described high feed voltage is-48V, and the puncture voltage of described voltage-stabiliser tube D6 is 48V.
A kind of specific implementation process of locating the detection method of the circuit of dispatching desk ringing-current breakdown fault provided by the invention is as follows:
When dispatching desk is in static state (namely telephone set is in without ring, without getting machine state), because of without ringing-current, the triode T1 of bell flowing detecting circuit ends because of the trigger current without ringing-current, because nothing gets machine (telephone set DC circuit is disconnected), voltage-stabiliser tube D6 punctures because of the high feed voltage of-48V, the forward bias that triode T2 provides through resistance R4, resistance R5, electric capacity C3 and conducting, triode T3 ends.Because triode T1 cut-off, triode T3 end, triode T4 cannot obtain forward bias current and end, and dummy resistance RL and L1 and L2 major loop disconnect.
When dispatching desk initiates to breathe out, the triode T1 of bell flowing detecting circuit is because ending without ringing-current trigger current, voltage-stabiliser tube D6 because getting low-voltage that machine is formed and cannot puncture and ending, triode T2 also ends without forward bias voltage, triode T3 conducting, make the triode T4 of dummy load switching circuit obtain forward bias current because triode T1 ends and end, therefore dummy resistance RL and L1 and L2 major loop disconnect.
During incoming call dispatching desk, by switch command scheduling platform to the ringing telephone stations connected separately, the triode T1 of bell flowing detecting circuit is by electric capacity C1, resistance R1, diode D5, resistance R2, electric capacity C2, resistance R3 circuit, obtain forward bias current and conducting, and made by the energy storage effect of electric capacity C2 T1 maintain conducting one predetermined time.Now, if answer without getting machine, ringing-current breakdown fault testing circuit, voltage-stabiliser tube D6 conducting because of high electrical breakdown, the forward bias that triode T2 provides through resistance R4, resistance R5, electric capacity C3 and conducting, triode T3 ends.Because triode T1 cut-off, triode T3 end, triode T4 cannot obtain forward bias current and end, and dummy resistance RL and L1 and L2 major loop disconnect.If the machine of getting is answered, voltage-stabiliser tube D6 because getting low-voltage that machine is formed and cannot puncture and ending, triode T2 also ends without forward bias voltage, triode T3 conducting, because triode T1 is still in maintenance conducting state, therefore triode T4 conducting because of the conducting of triode T1, T3, dummy resistance RL and L1 is communicated with L2 major loop, and makes T4 maintain conducting one predetermined time because of the energy storage effect of electric capacity C4.
In sum, a kind of circuit and detection method thereof of locating dispatching desk ringing-current breakdown fault provided by the invention, can thus solve the problem that the incoming call that causes because of ringing-current breakdown fault cannot answer, fix a breakdown, realize the work of dispatching desk safety and stability.
Above-listed preferred embodiment provided by the invention; the object, technical solutions and advantages of the present invention are further described; be understood that; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. can locate the circuit of dispatching desk ringing-current breakdown fault for one kind, it is characterized in that: comprise bell flowing detecting circuit, ringing-current breakdown fault testing circuit and dummy load switching circuit, described bell flowing detecting circuit is electrically connected by the base stage of electric capacity C1 one end through resistance R1, diode D5 and triode T1, and the collector electrode of triode T1 is connected to external power source positive pole through resistance R7; The other end of electric capacity C1 and input L1 and L2 of dispatching desk exchange interface major loop are electrically connected; Described ringing-current breakdown fault testing circuit is electrically connected through the base stage of resistance R4 and triode T2 by the anode of a voltage-stabiliser tube D6, and the collector electrode of triode T2 is connected to external power source positive pole through resistance R6 and is electrically connected with the base stage of triode T3; The collector electrode of triode T3 and the emitter of triode T1 are electrically connected, and the negative electrode of voltage-stabiliser tube D6 is electrically connected through input L1 and L2 of a bridge rectifier bridge and dispatching desk exchange interface major loop; Described dummy load switching circuit is made up of a triode T4 and dummy resistance RL, the base stage of described triode T4 and the emitter of triode T3 are electrically connected, the collector electrode of triode T4 is connected with the negative electrode of voltage-stabiliser tube D6 through dummy resistance RL, and the emitter of triode T4 is connected to another output of bridge rectifier bridge; The base stage of described triode T2 is all connected with the emitter of triode T4 with the emitter of emitter, triode T3, the base stage of triode T1.
2. a kind of circuit of locating dispatching desk ringing-current breakdown fault according to claim 1, is characterized in that: input L1 with L2 of described dispatching desk exchange interface major loop is connected with one end of electric capacity C1 through described bridge rectifier bridge; Output one end of described bridge rectifier bridge is connected with the negative electrode of voltage stabilizing end D6, and the other end is connected to the emitter of triode T4.
3. a kind of circuit of locating dispatching desk ringing-current breakdown fault according to claim 1, is characterized in that: the emitter of described triode T3 is connected with the emitter of triode T4 through electric capacity C4.
4. a kind of circuit of locating dispatching desk ringing-current breakdown fault according to claim 1, is characterized in that: the base stage of described triode T1 is connected with the emitter of triode T4 through resistance R2, R3.
5. a kind of circuit of locating dispatching desk ringing-current breakdown fault according to claim 1, it is characterized in that: the base stage of described triode T2 is connected with the emitter of triode T4 with electric capacity C3 through resistance R5 respectively, and be connected with the emitter of described triode T2; The output of described resistance R4 be connected with electric capacity C3 with resistance R5 respectively.
6. a kind of circuit of locating dispatching desk ringing-current breakdown fault according to claim 1, is characterized in that: the emitter of described triode T1 is also electrically connected through the base stage of electric capacity C2 and resistance R2 and triode T1 respectively, and electric capacity C2 and resistance R2 is in parallel.
7. a kind of circuit of locating dispatching desk ringing-current breakdown fault according to claim 1, is characterized in that: the puncture voltage of described voltage-stabiliser tube D6 is 48V.
8. an a kind of detection method of locating the circuit of dispatching desk ringing-current breakdown fault as claimed in claim 1, is characterized in that, comprise the following steps:
Step S0: detect whether have ring by the triode T1 of bell flowing detecting circuit; Judge whether telephone set gets machine by the voltage-stabiliser tube D6 in ringing-current breakdown fault testing circuit; If without ring and without getting machine, then dispatching desk is in static state, goes to step S1; If without ring, get machine, then dispatching desk sends exhalation, goes to step S2; If there is ring, without getting machine, then outside incoming call dispatching desk, goes to step S3; If there is ring, get machine, then outside incoming call dispatching desk, goes to step S4;
Step S1: the triode T1 of bell flowing detecting circuit is because ringing-current triggers cut-off; Because nothing gets machine, namely telephone set DC circuit is disconnected, in ringing-current breakdown fault testing circuit, voltage-stabiliser tube D6 punctures because of high feed voltage, the forward bias that triode T2 provides through resistance R4, resistance R5, electric capacity C3 and conducting, triode T3 ends, because triode T1 and T3 ends, make triode T4 in dummy load switching circuit cannot obtain forward bias current and end, dummy resistance RL and dispatching desk exchange interface major loop L1 and L2 major loop disconnect;
Step S2: the triode T1 of bell flowing detecting circuit is because ending without ringing-current trigger current, voltage-stabiliser tube D6 cannot puncture because getting low-voltage that machine is formed and end, triode T2 is ended without forward bias voltage, now triode T3 conducting, make the triode T4 of dummy load switching circuit obtain forward bias current because triode T1 ends and end, dummy resistance RL and dispatching desk exchange interface major loop L1 and L2 major loop disconnect;
Step S3: the triode T1 of bell flowing detecting circuit obtains forward bias current and conducting, and triode T1 maintains conducting to predetermined time; Now, because answering without getting machine, by voltage-stabiliser tube D6 conducting because of high electrical breakdown in ringing-current breakdown fault testing circuit, triode T2 conducting, triode T3 ends; Triode T1 reaches scheduled time cut-off, triode T3 ends, and triode T4 cannot obtain forward bias current and end, and dummy resistance RL and dispatching desk exchange interface major loop L1 and L2 major loop disconnect;
Step S4: the triode T1 conducting of bell flowing detecting circuit, voltage-stabiliser tube D6 cannot puncture because getting low-voltage that machine is formed and end, and triode T2 are ended, triode T3 conducting; Triode T1 is still in maintenance conducting state, and triode T4 conducting because of the conducting of triode T1 and T3, dummy resistance RL and dispatching desk exchange interface major loop L1 are communicated with L2 major loop, and maintain conducting to predetermined time.
9. a kind of detection method of locating the circuit of dispatching desk ringing-current breakdown fault according to claim 8, is characterized in that: in step S3 or S4, when incoming call dispatching desk, by switch command scheduling platform to the ringing telephone stations connected separately.
10. a kind of detection method of locating the circuit of dispatching desk ringing-current breakdown fault according to claim 8, is characterized in that: and described high feed voltage is-and the puncture voltage of 48V, described voltage-stabiliser tube D6 is 48V.
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| CN201510910552.0A CN105357406B (en) | 2015-12-10 | 2015-12-10 | A kind of circuit and its detection method for positioning dispatching desk ringing-current breakdown fault |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5712910A (en) * | 1995-07-28 | 1998-01-27 | Nec Corporation | Ring trip circuit having a simple trip detecting circuit of a high response speed |
| CN1230841A (en) * | 1998-03-29 | 1999-10-06 | 孙连仲 | Ringing-signal feeding method for telephone exchange |
| US20120027009A1 (en) * | 2010-07-30 | 2012-02-02 | Hon Hai Precision Industry Co., Ltd. | Communication device and method thereof |
| CN102148890A (en) * | 2011-02-28 | 2011-08-10 | 黄勇 | Party-line telephone interlocking device |
| CN205179179U (en) * | 2015-12-10 | 2016-04-20 | 厦门市广哈通信产品有限公司 | Can fix a position circuit of ticket distributing position ringing current puncture trouble |
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| CN105357406B (en) | 2018-02-02 |
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